1. Usually, similar situations improve after cleaning the carburetor. I don't know if it was thoroughly cleaned after taking it apart. If the problem persists after thorough cleaning, check if the air filter is clogged or damp. . Also check if the air shutter is broken (especially on scooters, the electronic air shutter is easily overlooked). The other thing is to check if the mixture ratio screw has fallen out. \x0d\\x0d\2. Also check if the intake manifold (the rubber elbow that connects the cylinder head and carburetor) is aged, cracked, or leaking air. \x0d\\x0d\3. Then check if the oil system is smooth and if the vehicle pumps oil when it is started electrically. \x0d\\x0d\4. The final step is to check if the ignition system is working properly. You can unscrew the high voltage box, then approach the metal part of the frame and start it.electrically to check if the ignition spark is lit. solid and stable. If it is unstable, check the coil, igniter, high voltage box and finally the spark plug.
How to separate cylinders from cb400 high pressure pack
You didn't say what year your car is or how many miles it has been on.
There are several difficulties when starting a cold car.
1. If it is a carburetor, the electronic enrichment valve is not working properly. Usually in this case a little oil. can be used to start. Just put it on, but you need to keep the oil to avoid extinction.
2. If it is an EFI vehicle, check the water temperature sensor, oxygen sensor and air flow sensor, and clean the fuel injector.
3. Cold engine valve clearance is too small.
4. The valve is leaking.
5. The spark plug is presentte heavy carbon deposits, or the high pressure assembly and igniter age, making it difficult for the spark intensity to break down and the mixture to ignite.
According to the original poster's instructions, the first and last items are more consistent. The poster can purchase a bottle of 3M 4-in-1 additive and add it proportionally, replace the spark plug and check the cylinder pressure, spark plug firing force and whether the intake valves and exhaust have excessive carbon deposits or are badly worn.
The steps of dividing the cylinder of the cb400 high pressure package are as follows:
1 Have the appropriate mechanical skills and tools and disconnect the battery before carrying out the operation. any motor maintenance Connect to protect against electric shock.
2. Open the coolant drain boltu engine and drain the coolant into a suitable container. To prevent fluid leakage when disassembling the cylinder.
3. Use appropriate tools to remove the various connecting bolts on the cylinder head, ignition coil, intake pipe and exhaust pipe. Remove the cylinder head carefully without damaging the sealing surfaces.
4. Use a wrench or wrench to loosen the cylinder bolt. Follow correct sequence and torque specifications to avoid motor damage.
5. Disassemble the piston and connecting rod: Once the cylinder bolts are loose, carefully remove the piston and connecting rod from the cylinder. This requires a bit of skill and patience to ensure you don't damage the walls of the piston or cylinder.
6. Cleaning work: Before reinstalling the new high pressure assembly, be sure to thoroughly clean the piston, connecting rod and wallof the cylinder. clearRemove any debris, oil or dirt, leaving the surface smooth and clean.
7. According to the manufacturer's instructions, the new high pressure unit is correctly installed on the engine. The high pressure assembly is correctly aligned and the bolts are tight. Tighten to recommended torque specifications.
8. Reassembly: Reassemble the engine components in reverse order. Install the piston and connecting rod, tighten the cylinder bolts, then install and tighten the cylinder head. All connecting bolts are tightened correctly.
9. According to the manufacturer's recommendations, add appropriate coolant after reassembling the engine.
CB400 refers to a mid-size motorcycle produced by Honda, whose full name is CB400superfour. It was first launched in 1992 and has seen many versions and modifications until now. The car uses a DOHC four-stroke engine refwater-cooled with a displacement of 399 cc, a maximum power of 53 horsepower, a maximum torque of 38 Nm and a six-speed gearbox.